Malicious PDF — malware analysis report

Static analysis result for SHA-256 812036dfcd8350ee…

MALICIOUS

PDF

73.3 KB Created: 2021-08-27 22:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c88427615766676dd0b2e9242e8920e9 SHA-1: 316e1dee181e6760080bae5d086bbeb2b8573462 SHA-256: 812036dfcd8350ee5905d2e2070cd7821c2bd8cb22f597a79d72d54ffac8d2a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, possibly for SEO manipulation or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=harry+potter+and+the+deathly+hallows+2+torrent PDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56c0d41e6---mijom.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210826_012916.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gunale.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082017618ab0---beduzis.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3da10f64f---25232656117.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/kotuzupigaset.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/36421137579.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0f017d7c0---pokiguzedali.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/4836798591.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1846f20101---55456244189.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160901486e7e36---letogadusinikaw.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/36989051538.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ec33af0f---21527296823.pdfIn PDF document text
    • https://eternalbliss.net/file/janubugazototumikuluw.pdfIn PDF document text
    • https://visualarchive.bg/files/42959415757.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ebsbkohi1g5kdjeodr5f32vu0p/13634974410.pdfIn PDF document text
    • https://rcot.org/userfiles/file/73390488443.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/21358713699.pdfIn PDF document text
    • http://tw-go.org/files/fixadezoseforatiba.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81104760596.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6b5300176db6f4438e9dc03d035d97bc/42424714385.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/51064146532.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 10708 bytes
SHA-256: fed713cdfcdf26b960888657f9b31cd36144574b8e19e19c7a0a057076b93f77
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 14924 bytes
SHA-256: 8a6486e9e6f59da64f7655dd0410725e587afca00cec81cdcae215963e040869
font_02_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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